var arr=[3322,245,387,2,1246]
var max = [min=arr[0]];
for(var i =1;i<arr.length;i++){
    if(arr[i]>max){
        max=arr[i]
    }
    if(arr[i]<min){
        min= arr[i]
    }
}
console.log(''+max);
console.log(''+min);